John Shurna scored 30 points for the Wildcats (15-9, 5-7) and Reggie Hearn had 16, including 11 in the second half. Hearn's final basket, a layup with 10:13 to go, gave Northwestern a 48-47 lead. But Johnson's 3-pointer put the Boilermakers ahead to stay 60-57 with 6:21 remaining.